Since I swapped my HS65MG servos for MKS 95 servos I have noticed my Scorpion 45A ESC is really heating up. I have spikes on my servo bus voltage dropping down to 4.2V and had complete radio loss causing a crash.

You should use a separate bec with that speed control. I think it only has a 2 amp linear bec and that speed control will run a lot cooler with a separate bec.http://www.hobbyking.com/hobbyking/s...Reduction.html This is the one I am using on my 450 and never had a problem.

Yes, stay away from linear BECs with anything over a 2S (7.4V) pack. With a 3S it has to drop 11.1V down to 5V and linear BECs burn that 6.1V off as heat - all of the time. Switching BECs don't do this and run much cooler.

I have ds95s on my MT and was using BEC until last weekend. I swapped my Align's 35A ESC for HeliDirect one from HK - 45A version (YGE clone?) and dropped BEC... No problems even with tic/tocs or really hard stops...

BTW I think I love that ESC and I'll get another two! Aside of gov store and other things it was known for, I flew it in ambient temperature of 15-17C and at roughtly 70-80% of throttle doing lots of flips and rolls (and half piro flips and full piro flips) and when it landed I checked the temperature of ESC. It was COLD! Not gently warm as I expected (or on warmer/hotter side some bad ones were) - but COLD as ambient temperature! Definitively less than 36C (and probably around 20C!) as I could feel it being cold! LOL... Sorry - I just digressed!

One more detail: aside of MKS DS95s as feathering servos I have S9257 for tail (so still big and power hungry servo)...

Looks like a nice ESC you bought there. Unfortunately I already have my BEC on order, so I guess I will give it a go.

Where did you mount your BEC when you had one? I was thinking about piggybacking it on the ESC. Not the best idea for heat dissipation I guess, but neatly tucked away there (under the battery tray) if there's room.

If the BEC isnt up to it I will be ordering the same ESC as you.

I have looked up my Scorpion ESC and its internal BEC is rated at 6V/4amp 5 to 15V and is a linear BEC which may explain why it overheated with the DS95 servos respect to the HS65MG ones.

I have ds95s on my MT and was using BEC until last weekend. I swapped my Align's 35A ESC for HeliDirect one from HK - 45A version (YGE clone?) and dropped BEC... No problems even with tic/tocs or really hard stops...

Looks like a nice ESC you bought there. Unfortunately I already have my BEC on order, so I guess I will give it a go.

Where did you mount your BEC when you had one? I was thinking about piggybacking it on the ESC. Not the best idea for heat dissipation I guess, but neatly tucked away there (under the battery tray) if there's room.

If the BEC isnt up to it I will be ordering the same ESC as you.

I did same as you're suggesting: just piggybacked it to ESC.

Quote:

Originally Posted by nickyd

I have looked up my Scorpion ESC and its internal BEC is rated at 6V/4amp 5 to 15V and is a linear BEC which may explain why it overheated with the DS95 servos respect to the HS65MG ones.

Thanks for the info.

Nick.

Now you're writing about it - I didn't have BEC on my MT until I got DS95s! It started overheating and cutting off. Fortunately it did it while I was on the ground setting it up and playing with servos.

I was going to order one to give it a try, but they are out of stock.
If it is in fact an exact YGE clone, then I should be able to use my YGE Program Card II with it. Anyone tried it? I have an authentic YGE 60A on my Protos and I love it. Top of the line ESC.

Now you're writing about it - I didn't have BEC on my MT until I got DS95s! It started overheating and cutting off. Fortunately it did it while I was on the ground setting it up and playing with servos.